Bug 139872 - libnss_files.so does not process /etc/hosts file properly
libnss_files.so does not process /etc/hosts file properly
Product: Fedora
Classification: Fedora
Component: glibc (Show other bugs)
i686 Linux
medium Severity low
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Assigned To: Jakub Jelinek
Brian Brock
Depends On:
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Reported: 2004-11-18 10:55 EST by Kovalevich Victor
Modified: 2007-11-30 17:10 EST (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2004-11-18 12:37:53 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Kovalevich Victor 2004-11-18 10:55:53 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.3) Gecko/20041020

Description of problem:
nsswitch.conf file contains following line for 'hosts' key:

hosts: files dns

File /etc/hosts contains following lines:   localhost       localhost.localdomain

In such case it is impossible to get any kind of information about
hosts listened above. If /etc/hosts is modified as below:       localhost       localhost.localdomain

everythin is ok.

'getent' and 'ping' utilities were used to check whether host
information is available or not.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. vi /etc/hosts;
2. add '0' up to 3 symbols in every IP address  byte (e.g.

Actual Results:  1. Usinf 'ping':

# ping localhost
ping: unknown host localhost

2. Using 'getent'
# getent hosts
< nothing >

Expected Results:  # ping localhost

<something like below>

PING fox ( 56(84) bytes of data.
64 bytes from fox ( icmp_seq=0 ttl=64 time=0.036 ms
64 bytes from fox ( icmp_seq=1 ttl=64 time=0.028 ms
64 bytes from fox ( icmp_seq=2 ttl=64 time=0.034 ms
64 bytes from fox ( icmp_seq=3 ttl=64 time=0.048 ms
64 bytes from fox ( icmp_seq=4 ttl=64 time=0.030 ms

--- fox ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3999ms
rtt min/avg/max/mdev = 0.028/0.035/0.048/0.008 ms, pipe 2

# getent hosts       localhost.localdomain localhost

Additional info:

This unexpected behaviour was found in FC3 only. FC2's libnss_files.so
works properly.
Comment 1 Jakub Jelinek 2004-11-18 12:37:53 EST is not a valid IP address for inet_pton (AF_INET, ...).
See http://www.opengroup.org/onlinepubs/009695399/functions/inet_ntop.html
The inet_pton() function does not accept other formats (such as the octal numbers, hexadecimal numbers, and fewer than four numbers that inet_addr() accepts).
Your IP address has 3 octal numbers and one decimal, therefore it is not accepted.

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